FCC-ee e+ee^+e^- Injection and Booster rRng

Mar 3, 2023
9 pages
Published in:
  • JACoW eeFACT2022 (2023) 227-235
Contribution to:
  • Published: Mar 3, 2023

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Abstract: (JACOW)
The Future Circular electron-positron Collider (FCC-ee) is a proposal for a 91.17 km collider, which would operate in four modes with energies ranging from 45.6 GeV (Z-pole) to 182.5 GeV (ttbar-production). At high energies the beam lifetime could be as low as 6 minutes, requiring the beam to be continuously topped up to reach a high integrated luminosity. This top-up injection would use a separate booster ring in the same tunnel as the collider, which would accelerate the beams to the collider energy. The booster ring should achieve a lower equilibrium emittance than the collider, despite challenges such as a long damping time and no magnet-strength tapering to compensate for the impact of synchrotron radiation. For top-up injection into the collider, we consider two strategies: conventional bump injection, employing a closed orbit bump, and injection using a multipole kicker magnet. On-axis and off-axis sub-schemes will be studied for both. We compare these injection strategies on aspects including spatial constraints, machine protection, perturbation to the stored beam and hardware parameters.
  • injection
  • booster
  • septum
  • kicker
  • collider
  • beam: injection
  • booster
  • FCC-ee
  • hardware
  • synchrotron radiation